4 Inch Long Screws Factory, Get Close To Shi Shi Tong

In the past two years, the screws produced by Shenzhen Shi Shi Tong screw manufacturers have been sold to the United States, Canada, the United Kingdom, Australia and other places. Among them, there are several kinds of 4 inch long screws alone.

The top one is a cup cap head hexagon socket 4 inch long screws, all made of carbon steel material, including white zinc plated, black zinc plated and nickel plated. Anyone familiar with the screw industry knows that the longer screw, the more expensive the electroplating cost. Sometimes it even needs to be processed on the ground, which makes the price even more expensive.

This one is a carbon steel phillips hex washer head 4 inch long screws, surface treatment is eco color zinc plated. If you look closely at the picture, you can also see the serration below the head. This spline is mainly for anti-slip locking function.

It’s confusing to see why these long screws are half thread. This is mainly because the longer screw, the higher the cost of full thread, and half of the screw can also achieve a tightening role. What is the production process of these screws? Now long screw production process is mainly cold heading and welding. Cold heading is mainly used to make the head and pole one-time forming. Welding is to weld the two parts of the head and screw rod together. The advantage of welding is that it is cheaper, and the disadvantage is that the head pole break easily than the cold heading. The advantage of cold heading is not easy to break, the disadvantage is because of the use of the mold, the price is more expensive than welding.

If you want to know more about 4 inch long screws, please contact us: sst@szsst88.com